[Ardour-Users] "Extract LTC from audio and align video" menu option missing from "Transcode/Import Video file" popup

Chris Caudle chris at chriscaudle.org
Tue Apr 3 09:19:57 PDT 2018

On Mon, April 2, 2018 9:25 pm, robertlazarski . wrote:
> The F8 is my single timecode generator source. I do not have a nice camera
> like RED, that has a BNC input for timecode. So I am recording LTC on the
> phone camera CH1 of its stereo track.

OK, good, you already have a single time code source so that eliminates
one problem (free running time sourced drifting relative to one another).

> I was seeing that "00:00:01.00" start time of the MP4 LTC but didn't know
> what it meant. That was the default of the F8. That was a clue, so I
> changed it to RTC and now I see "time of day" timestamps in the LTC, but I
> am still not syncing correctly as I am a few seconds off.

The default might be OK, just depends on whether you need to know the
actual time it was recorded or if you might have a full day worth of
recordings to go through.  Setting to actual (wall clock) time could have
the disadvantage that Robin pointed out, if you import directly into
Ardour you may end up with a project with 12 or 15 hours of blank space at
the beginning.

I had to find the manual for the R8, it seems to have several options for
timecode settings.
Internal free run vs.  internal record run is one, when set to record run
there could be some delay in starting up the time code generator when you
start recording.  Not for sure, just something to verify.  Should not be
an issue when set to internal RTC run according to the manual description.

Is internal auto mute set to on or off? That mutes timecode output when
recording is stopped, that could be another place that there is an
indeterminate delay when going from off to on.

It might be useful to use a clapboard or similar to give you an easy to
find location in the audio and video to check whether the "few seconds
off" value is always the same or whether it changes from start to start.

Chris Caudle

More information about the Ardour-Users mailing list